2014 // HM // Mr. Douglas Moore // University of Wisconsin - Stevens Point // WI, USASpecimen: Petrified tree fern, Tietea singularis from the late Carboniferous/early Permian period around 290 million years ago. Tietea singularis grew up to 36 feet tall. This image shows vascular tissue in the center of the stem. The specimen is from Bieland, Maranhao Province, BrazilTechnique: Photographed at 25xTags:Fossil // Plant